About: http://webisa.webdatacommons.org/38175121

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The best source of retinal is liver and a small amount 3g meets the body???s daily requirements. 700mcg per day is a sufficient amount per adult which can also be derived from the beta carotene foods eg. 2oz raw carrots.
http://www.w3.org/ns/prov#wasQuotedFrom	houseofnutrition.com